Benjamin Lu da56c9e554 feat: integrate Impact telemetry with checkout attribution for subscriptions (#8688) ...

Implement Impact telemetry and checkout attribution through cloud
subscription checkout flows.

This PR adds Impact.com tracking support and carries attribution context
from landing-page visits into subscription checkout requests so
conversion attribution can be validated end-to-end.

- Register a new `ImpactTelemetryProvider` during cloud telemetry
initialization.
- Initialize the Impact queue/runtime (`ire`) and load the Universal
Tracking Tag script once.
- Invoke `ire('identify', ...)` on page views with dynamic `customerId`
and SHA-1 `customerEmail` (or empty strings when unknown).
- Expand checkout attribution capture to include `im_ref`, UTM fields,
and Google click IDs, with local persistence across navigation.
- Attempt `ire('generateClickId')` with a timeout and fall back to
URL/local attribution when unavailable.
- Include attribution payloads in checkout creation requests for both:
  - `/customers/cloud-subscription-checkout`
  - `/customers/cloud-subscription-checkout/{tier}`
- Extend begin-checkout telemetry metadata typing to include attribution
fields.
- Add focused unit coverage for provider behavior, attribution
persistence/fallback logic, and checkout request payloads.

Tradeoffs / constraints:
- Attribution collection is treated as best-effort in tiered checkout
flow to avoid blocking purchases.
- Backend checkout handlers must accept and process the additional JSON
attribution fields.

## Screenshots

<img width="908" height="208" alt="image"
src="https://github.com/user-attachments/assets/03c16d60-ffda-40c9-9bd6-8914d841be50"/>
<img width="1144" height="460" alt="image"
src="https://github.com/user-attachments/assets/74b97fde-ce0a-43e6-838e-9a4aba484488"/>
<img width="1432" height="320" alt="image"
src="https://github.com/user-attachments/assets/30c22a9f-7bd8-409f-b0ef-e4d02343780a"/>
<img width="341" height="135" alt="image"
src="https://github.com/user-attachments/assets/f6d918ae-5f80-45e0-855a-601abea61dec"/>

2026-02-10 16:40:51 -08:00

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